前言

我们以geometry、pos、windowOpacity属性为例，来实现窗体的下坠、抖动、透明度效果。

效果

源码

下坠效果：

通过计算桌面的宽度、高度，来设置动画的起始值和结束值。

void MainWindow::onDropWindow()
{
    QPropertyAnimation *pAnimation = new QPropertyAnimation(this, "geometry");

    QDesktopWidget *pDesktopWidget = QApplication::desktop();
    int x = (pDesktopWidget->availableGeometry().width() - width()) / 2;
    int y = (pDesktopWidget->availableGeometry().height() - height()) / 2;

    pAnimation->setDuration(1000);
    pAnimation->setStartValue(QRect(x, 0, width(), height()));
    pAnimation->setEndValue(QRect(x, y, width(), height()));
    pAnimation->setEasingCurve(QEasingCurve::OutElastic);
    pAnimation->start(QAbstractAnimation::DeleteWhenStopped);
}

抖动效果：

获取界面的坐标，然后进行上、下、左、右坐标浮动，通过setKeyValueAt()来设置每一时刻的位置，实现抖动效果。

void MainWindow::onShakeWindow()
{
    QPropertyAnimation *pAnimation = new QPropertyAnimation(this, "pos");
    pAnimation->setDuration(500);
    pAnimation->setLoopCount(2);
    pAnimation->setKeyValueAt(0, QPoint(geometry().x() - 3, geometry().y() - 3));
    pAnimation->setKeyValueAt(0.1, QPoint(geometry().x() + 6, geometry().y() + 6));
    pAnimation->setKeyValueAt(0.2, QPoint(geometry().x() - 6, geometry().y() + 6));
    pAnimation->setKeyValueAt(0.3, QPoint(geometry().x() + 6, geometry().y() - 6));
    pAnimation->setKeyValueAt(0.4, QPoint(geometry().x() - 6, geometry().y() - 6));
    pAnimation->setKeyValueAt(0.5, QPoint(geometry().x() + 6, geometry().y() + 6));
    pAnimation->setKeyValueAt(0.6, QPoint(geometry().x() - 6, geometry().y() + 6));
    pAnimation->setKeyValueAt(0.7, QPoint(geometry().x() + 6, geometry().y() - 6));
    pAnimation->setKeyValueAt(0.8, QPoint(geometry().x() - 6, geometry().y() - 6));
    pAnimation->setKeyValueAt(0.9, QPoint(geometry().x() + 6, geometry().y() + 6));
    pAnimation->setKeyValueAt(1, QPoint(geometry().x() - 3, geometry().y() - 3));
    pAnimation->start(QAbstractAnimation::DeleteWhenStopped);
}

透明度效果：

设置每一时刻的透明度值，动画结束时界面还原（透明度再为1）

void MainWindow::onOpacityWindow()
{
    QPropertyAnimation *pAnimation = new QPropertyAnimation(this, "windowOpacity");
    pAnimation->setDuration(1000);
    pAnimation->setKeyValueAt(0, 1);
    pAnimation->setKeyValueAt(0.5, 0);
    pAnimation->setKeyValueAt(1, 1);
    pAnimation->start(QAbstractAnimation::DeleteWhenStopped);
}